Miniature tunable filter
US9287599B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2011 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Dec 1, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J1/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Described is a miniature tunable filter, comprising at least two adjacent coaxial-type resonators coupled to one another. Each coaxial-type resonator comprises a metal-coated ceramic dielectric cavity having a tuning rod passage formed therethrough. A tuning rod is inserted through the tuning rod passage, such that the miniature tunable filter is tuned by moving the tuning rod into and out of the tuning rod passage of the ceramic dielectric cavity. A low impedance coaxial section surrounds at least a portion of the tuning rod to create an effective microwave short-circuit at a resonant frequency of the miniature tunable filter, which results in very wide tuning and low insertion loss. In a desired aspect, the tuning rod is a solid metal tuning rod. The combination of a solid metal tuning rod with a ceramic coaxial-type resonator results in high radio frequency power handling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.